Facing-tool for dressing valve-seats, &amp;c.



F. L. SMITH & T. B. WILLIAMS. FACING TOOL FOR DRESSING VALVE SEATS, &c.

APPLICATION FILED FEB. 11. I916.

Patented May 22, 1917.

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W w m W F. L. SMITH (5L T. B WILLIAMS. FACING TOOL FOR DRESSING VALVESEATS, &c.

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Patented May 22, 1917.

APPLICATION FILED FEB. H. 1916- F. L. SMITH & T. B. WILLIAMS. FACINGTOOL FOR DRESSING VALVE SEATS, m.

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FRANK I4. SMITH, OF CHICAGO, ILLINOIS, AND THOMAS B. WILLIAMS, OFORANGE, MASSACHUSETTS, ASSIGNORS TO THE LEAVITT MACHINE COMPANY, 0ORANGE, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

FACING-TOOL FOR DRESSING VALVE-SEATS, 860.

Application filed February 11, 1916.

To all whom it may concern:

Be it known that we, FRANK L. SMITH and THOMAS B. WILLIAMs, citizens ofthe United States, and residents, respectively, of Chicago, in thecounty of Cook and State of Illinois, and Orange, in the county ofFranklin and State of Massachusetts, have invented certain new anduseful Improvements in Facing-Tools for Dressing Valve- Seats, &c., ofwhich the following is a specification.

This invention relates to a facing tool for dressing valve seats, etc.and particularly to a tool adapted for recutting valveseats, etc. thathave become worn or pitted as a result of long use, this class of toolsbeing of a type especially adapted for attachment to a valve-casing andrefacing a valve-seat in a pipe-line, or other location, in situ.

The present invention is an improvement upon those disclosed in ourprior applications filed January 23, 1915, Serial Nos. 3897, 3898, and3899 respectively. The prin cipal feature common to the tools of all ofsaid three applications is a tool having two main parts, to wit, acutter and a cutter-bar, in which the general direction of the tool istransverse to the cutting axis and which operates against or between twofixed resistance points or surfaces of the work or article to which thetool is attached. In all of said tools an important feature of theconstruction is a pivotal or universal connection between the aforesaidmain parts, this connection permitting relative adjustment of said partscrosswise of the tool, and in addition adapting the tool, when theconnection is a universal one, for operating upon valve-seats at anacute angle to each other. In the tools of all of said applicationsvarious important adjustments of parts for assuring the proper operationof the tool under many different conditions of use are provided for, andin the third of said applications provision is made for effecting saidadjustments from the most convenient point, that is, from apoint outsidethe valve-casing in which the cutter is intended to Work, and preferablyfrom the extreme outer end of the tool. The tool of Specification ofLetters Patent.

Patented May 22;, 1917.

Serial No. 77,632.

the present application is one in which substantially all of thesefeatures are preferably retained.

The tool of the present application is how ever distinguished from thoseof the applications just mentioned in many respects. In the first placeit is a tool in which a pivotal element carried by the cutter-bar isadjustable crosswise of said cutter-bar by means operable from a pointoutside a valvecasing. In the second place it is a tool in which thecutter-bar is attached to the valvecasing in a radically differentmanner from the tools of any of said prior applications. In the presenttool the points of attachment of the cutter-bar to the valve-casing arenear the working end of the tool and in or close to the cutting zone, aplurality of relatively movable parts on the cutter-bar and near thecutter being employed for engaging the interior of a valve-casing atdifferent points and holding the cutter-bar to said casing. Thepreferred construction is one in which these elements for engaging thevalve-casing bear a predetermined relation to the axis of the pivotelement on the cutter-bar by means of which said cutter-bar is broughtinto proper working relation with the cutter and its support; and saidmovable elements for engaging and holding the valve-casing arepreferably so constructed as to constitute elements of an eXpansiblecentering device, forming substantially an expansible chuck, forengaging the inner circular wall of a valve-ring. In the third placethis centering device just described is preferably so constructed as tobe capable of being set in different positions for cooperation withvalve-rings either of large or of small diameter, and it also preferablyhas a considerable range of adjustment in each of said settings.

Various other features of our present in vention not hereinbeforereferred to will be hereinafter described and claimed and areillustrated in the accompanying drawings in which:

Figure 1 is a sectional side elevation of a facing tool embodying ourpresent invention in operative relation with a pair of valve-seats in avalve-casing.

Fig. 2 is an end elevation of the same, looking from the left in saidview.

Figs. 3, 41- and 5 are enlarged views of the cutter-bar of said toolshowing the same in side and edge elevations with the centering deviceexpanded, said views being respectively an outer side elevation, an edgeelevation and an inner side elevation of said cutter-bar.

Fig. 6 is a view similar to Fig. 3 showing the position of the partswith the centering device contracted.

Fig. 7 is a view showing in transverse section, taken in line 7-7 ofFig. 6, means for obtaining a quick and a slow adjustment of the mainpivot and the centering device lengthwise of the cutter-bar.

Fig. 8 is a view similar to Fig. 6 of the lower part of the cutter-bar,showing the parts of the centering device set in a different adjustment.

Fig. 9 is a substantially central longitudinal section of a portion ofthe same, the section being taken crosswise of the plane of thecentering device and its associated parts.

Figs. 10 and 11 are respectively an elevation and a central longitudinalsection of a support for and the extension of the main pivot by means ofwhich the cutter-bar is associated with the cutter.

Fig. 12 is a detail of said pivot.

Figs. 13 and 14 are respectively side and edge elevations of the mainframe of the cutter-bar.

Figs. 15 and 16 are similar views of a cam slide for adjusting the mainpivot of the cutter-bar transversely.

Figs. 17 and 18 are details showing opposite sides of the centeringdevice with the elements thereof expanded substantially to their maximumdiameter.

Fig. 19 is a detail of the lower end of a cam-lever for adjusting thecentering device in any setting thereof.

Similar characters designate like parts in all the figures of thedrawings.

Like the tools shown in the aforesaid applications our present tool ispreferably one made up of two main parts connected by a pivotal oruniversal joint and is disposed in a general direction transverse to theaxis of the cutter-bar and adapted for operation while in engagementwith a plurality of resistance points or surfaces located outside thetool, that is lying in the work or its equivalent. Like said other toolsthis one is also one having comparatively thin main members in orderthat it may work in small spaces. The cutter is preferably, as in theaforesaid applications, a rotary cutter op-- erated by a ratchet-feedlever connected to the cutter in such a manner that this main element asa whole occupies as little space as possible in the direction of itsthickness.

The two main elements of our present tool may be of any suitableconstruction coming within the foregoing disclosure. They are preferablya ratchet-feed cutter of any suitable type, such as A, and a cutter-bar,such as B. These two main elements will have a pivotal connection,usually a face-toface connection, as by means of a ball-and-socketjoint, 23, for permitting ready connection and disconnection of thesemain elements by movement substantially in a straight line crosswise ofthe tool.

The element A comprises a lever, 1, a cutter proper, 0, and aratchet-feed connection between said lever and cutter for convertingoscillating movement of the lever about the cutting axis into astep-by-step rotation of the cutter proper. This cutter 0 preferably hasa multiplicity of cutting blades or cutters proper, 0, as in theaforesaid applications, the specific features of said ratchetfeed cutterbeing set forth more fully in a separate application filed by us January23, 1915, Serial No. 3900.

The main element B, is as before stated, a bar insertible down into thevalve-casing C and adapted to form a support for the cutter. Usually thetwo main parts A and B will engage directly and work between resistancepoints or surfaces, such as those shown at a" and r, the relativeseparation of the two main parts serving to wedge them between theseoppositely disposed resistance surfaces.

Suitable means must of course be employed for holding the two mainelements A. and B in proper working relation when the tool is in use.That employed in the present differs greatly from the correspondingmeans of the aforesaid applications. Here, while the cutter-bar, as insaid other tools, constitutes the principal means for locating thecutter in place, it is held in a direction lengthwise thereof inengagement with a plurality of points in the interior of thevalve-casing C, this result being brought about by providing acutter-bar having near the cutter a plurality of relatively movableelements for engaging the interior of said valve-casing. Preferably weprovide a plurality of elements on the cutter-bar movable to differentradial positions with respect to the axis of the main pivot element 2,the construction shown being one in which these relatively movable partsfor engaging and holding the interior of the valvecasing constituteelements of a centering device, or expansible chuck, the holdingelements or jaws of which engage the inner side of the annularvalve-ring embodying the valve-seat 7" (or 1"). By merely extending theholding elements or jaws of this centering device or chuck the innersurface 10 or w of said valve-ring will be firmly gripped; and thecentering device may be held in such posi tion in any suitable manner.The construction is also such that when wedged tightly in place thecutter-bar will be properly located crosswise as well as lengthwise.

In the specific construction illustrated the cutter-bar frame is made upof a pair of side rails, 66, connected by an upper crossbar, 7 and alower connector, here shown as a disk, 8, with a central projectingbearing or hollow stud, 9. The interior of this hollow stud is intendedto receive the pivot element 2 and also a combined bushing and operatingslide controlling the transverse position of said pivot element andforming an extension of it. The exterior of said hollow stud is hereintended to support an operating device for changing the adjustment ofthe holding members of the centering device or chuck.

The centering device is intended primarily as a means for assuring themaintenance of the axis of the pivot element 2 in its proper position inall adjustments, to adapt the tool for facing tools of differentdiameters. Its construction is preferably such that the holding elementsor jaws there of will always move equal distances measured from the axisof the pivot element 2, in the adjustment from one diameter to another,and also in making the necessary fine adjustments for engaging avalve-ring of any given diameter after the centering device has beenlocated approximately in position for cooperation therewith. Here boththe pivot element and the centering device are carried by a commonsupport, each being shown as in fixed relation, in the direction of saidradial adjustment, to the hollow stud 9 at the lower end of thecutterbar frame. The centering device illustrated comprises a.supporting plate or ring, 10, and a circuit of holding elements in theform of short levers or jaws, 11 pivoted thereto. The supporting ring 10is shown as mounted to turn on the outer bearing surface of the hollowstud 9 and as in contact at its inner face with the outer faces of thelevers or jaws 11, which lie between the supporting ring 10 and theoperating device be fore mentioned, which is preferably an operatingcam-lever and rests against the outer face of the disk 8 of thecutter-bar frame. Each of the holding elements or jaws 11 is shown asconnected to the ring 10 by a pivot-pin, 12, which extends outwardly butdoes not project in this case beyond the outer face of said ring 10.Normally the ring 10 is intended to be held in fixed relationwith thehollow stud 9, and hence with the cutter-bar frame. Any suitable meansmay be employed for this purpose. Here said ring, which is shown asmounted to move about the axis of said hollow stud (for a. purpose whichwill be hereinafter described), is held fast by a face-plate, 13,secured to said hollow stud,

as by screws 14, and by a clamping screw, 15, passing through saidface-plate 13 and into the ring 10 in such a manner as to be capable ofholding said ring 10 so as to prevent relative movementcircumferentially between it and the hollow stud 9 and faceplate 13.

With said ring 10 set in any determined position the pivots 12 will befixtures with respect to the frame of the cutter-bar and the levers orjaws 11 may be swung about said pivots by suitable operating means,preferably a device extending to a point outside the casing and near tothe outer end of the cutter-bar. The device illustrated for this purposeis a cam-lever 16 mounted on the outer surface of the stud 9 so as toturn thereon. Said cam is here shown (see Fig. 19) as having threecam-slots, 17, in which pins, such as 18, at the power-points of thelevers or jaws 11, are intended to work. By simply swinging said lever16 in one direction or the other the multiple holding devices or jaws ofthe centering device are adapted in this case to be swung simultaneouslyequal distances toward or away from the axis of the pivot element 2, thecam slots 17 being all substantially alike. By means of this cam-lever afine adjustment of the parts is obtained after the centering device hasbeen positioned approximately as desired.

The principal holding elements vin this case are the flat faces, 19, ofthe studs, 20, projecting from said levers or jaws 11, that is, theseare the principal faces for locating the cutter-bar with respect to theannular valve-ring and centering the cutter-bar so that the axis of itsmain pivot element 2 will be at the center of the annular valvering. Forlocating the cutter-bar and centering device in the direction of theaxis of said valve-seat flat faces, 21, on the jaws serve, these flatfaces being in contact with the flat face or valve-seat of thevalve-ring.

The construction so far described is sufficient for effecting a fineadjustment of the centering device between two fixed limits affording aconsiderable range of adjustment of the tool so as to adapt it for usewith valve-rings of various diameters. In order to increase the range ofadjustment of said tool however and adapt it for use on a wider range ofdiameters it is necessary to provide additional means. This may be anysuitable means for the purpose; but the specific means illustrated is aconnection between the face-plate 13 and the ring 10 of the centeringdevice which permits said ring to be set and held in a different relation circumferentially to said face-plate 13. While the principalelement of this connection is the clamping screw 15, before described,said screw does not work in an ordinary threaded bore in the face-plate,but

instead passes through a comparatively lon slot, 22, therein and intothe ring 10, of which it constitutes substantially a part and which itserves to shift to any position between the ends of the slot 22. Whenthe screw 15 is at one end of said slot, as shown in Fig. 6, and isscrewed home so as to hold the ring 10 from rotation relative to theface-plate 13, the arms 11 of the centering device have one range ofadjustment between two limits. WVhen the screw 15 is at the other end ofsaid slot, as shown in Fig. 8, and is screwed home, the ring 10 is setin a different position and the parts 11 have a different range ofadjustment, by means of the cam-lever 16, between two limits one ofwhich is different from one of the limits of the first setting. Bysimply changing the circumferential position of the ring 10 through themanipulation of the screw 15 and then fastening said ring in the desiredposition the range of use of the tool is very greatly increased ascompared with a tool in which no such provision is made. In one case theparts are adjustable from the diameter shown in Fig. 8 down to thesmallest diameter, represented by the projections 20 resting in therecesses 23, of the faceplate 13, while in the other case the parts 11are adjustable in the same manner, by the camlever 16, from the limitillustrated in Fig. 6 to the maximum diameter shown in Figs. 17 and 18.The variation in the range of action results in this case from shiftingthe fulcra 12 of the holding levers or jaws 11, when the ring 10 isshifted, and the consequent swinging of said arms in different arcs inthe new setting when the cam-lever 16 is swung to apply power to thepower-points 18 of said levers 11 through the walls of the slots 17 Ineither setting of the parts provision should be made for holding thearms 11 in the positions to which they have been moved. Any suitablemeans may be employed for this purpose. Here a connecting link or rod isshown, at 2 1, as pivoted to the cam-lever 16 near the upper end thereofand as slidable through a bore in a post, 25, and adapted to be held atany point in its length by a clamping screw, such as 26. A stop-pin isillustrated, at 27, for engaging one of the lever arms 11 in theposition of maximum expansion of the centering device.

As before stated, another important feature of the invention is theprovision of means for adjusting the pivot element 2 crosswise of thecutter-bar from a point' outside the casing. In the construction shownthis pivot element 2 is mounted in a sleeve, S, slidable crosswise ofthe cutterbar in the hollow stud 9 on the fixed frame of said bar. Heresaid sleeve has a comparatively large head, 28, preferably rectangular,and suitable means at its inner side is shown, at 29, for preventingturning of said sleeve on the cutter-bar. The rectangular projection 29is intended, as shown in Fig. 9, to lie in the opening, 30, of theforked end of an actuating device for moving the sleeve crosswise of thecutterbar, the specific means illustrated for this purpose being acam-slide, S, and the head 28 of the sleeve S, which has a doublecountersink, as shown in Fig. 11, for the purpose of receiving in thiscase a two-diameter adjusting nut, 31 (see Fig. 9) which may be adjustedto different positions lengthwise of the pivot element 2 for the purposeof increasing the length of said pivot element, substantially as in thethird of our aforesaid applications. In order to prevent turning of thepivot element 2 in the sleeve S said pivot element is shown as having away or groove, 32, with which a key, 33, in the sleeve (see Fig. 11)cooperates. Thus the crosswise adjustment of the pivot element 2 may beeither that of the sleeve S alone or of said sleeve plus the desiredextension of the element 2 as will be clear by referring to Fig. 9.

As before stated the specific means shown for shifting the sleeve Scrosswise is a camslide S. At its lower end it is substantially wedgeshaped in edge elevation, as shown, and the outer surface thereof liesbetween the under side of the head 28 and the cutter-bar frame proper,the under side of said head being preferably tapered in both directionsfrom its center, as shown in Fig. i, in order to cooperate properly withthe tapered face of the cam-slide. The adjacent face of the fixed frameof the cutter-bar is also shown as correspondingly tapered in order toimprove the lines of the tool. For the purpose of operating saidcam-slide any suitable means may also be employed. Said slide fills thespace between the side-rails 6 of the fixed frame and at its upper endhas a lug, 34:, projecting laterally therefrom and having a threadedbore for the reception of a short feed-screw, 35, with a knurledoperating head, 36, at the extreme upper end of the tool. A portion ofthe shank of the feed screw is smooth so that said feed-screw may have asliding move ment sufficient to obtain a rough adjustment of theposition of the pivot element 2 with respect to the cooperating socket 3of the cutter. To obtain a fine adjustment, however, as by means of alatch, 37, pivoted, at 38, on the crossbar 7 of the cutter-bar andadapted to work between the under side of said cross-bar and a stop, 39,on the feedscrew 35. By turning the knurled head 36 when the parts arein position the desired fine adjustment is obtained.

The sleeve S and the pivot element 2 proper mounted therein are bothslidable freely relatively to each other, and also to the cutter-bar, ina direction crosswise thereof. For the purpose of keeping them in properrelation to the other parts when being adjusted crosswise of thecutter-bar and for maintaining any adjustment desired we have shown, at10, a moderately strong spring fastened at one end to the cutter-barframe and bent at its other end to engage both the head 28 of the sleeveand the nut 31 on the pivot element 2, for the purpose of exerting astrong pressure on both of them toward the outer face of the cutterbar,so that whether the cam-slide is moved down to shift the pivot element 2crosswise toward the socket 3, or is moved up to permit the sleeve S onthe pivot element 2 to withdraw from the socket 3, the pressure of thespring will always be in the proper direction for permitting andmaintaining the desired crosswise adjustment of the pivot element 2.

We claim 1. A tool of the class described, comprising a cutter, anassociated cutter-bar having near the cutter a plurality of partsrelatively movable in a plane substantially parallel to that of thecutter bar for engaging the interior of a valve-casing and holding thecutter-bar to said casing, and means for effecting relative movement ofsaid parts.

2. A tool of the class described, comprising a cutter, an associatedcutter-bar having near the cutter a plurality of parts relativelymovable in a plane substantially parallel to that of the cutter bar forengaging the interior of a valve-casing and holding the cutter-bar tosaid casing, and means for effecting relative movement of said parts andfor maintaining the adjustment so obtained.

3. A tool of the class described, comprising a cutter, an associatedcutter-bar having near the cutter a plurality of parts relativelymovable in a plane substantially parallel to that of the cutter bar forengaging the interior of a valve-casing and holding the cutter-bar tosaid casing, and means carried by the cutter-bar and operable from apoint outside the valve-casing for effecting relative movement of saidparts.

4. A tool of the class described, comprising two main members one ofwhich is a cutter and the other an associated cutterbar, means forwedging said tool in place between a pair of separated surfaces of avalve-casing, and adjustable means near the cutter for holding saidcutter-bar to the interior of said valve-casing against movement inanother direction.

5. A tool of the class described, comprising two main members one ofwhich is a cutter and the other an associated cutterbar, means forwedging said tool in place between a pair of separated surfaces of avalve-casing, and adjustable means near the cutter for wedging saidcutter-bar in place in the interior of said valve-casing againstmovement in another direction.

6. In a tool of the class described, a cutterbar having at differentpoints a plurality of parts relatively movable in a plane substantiallyparallel to that of the cutter bar for engaging the interior of avalve-casing and holding the cutter-bar to said casing, means foreffecting relative movement of said parts and a cutter associated withthe cutter bar.

7. In a tool of the class described, the combination with a cutter-barhaving near the working end thereof a plurality of parts movable in aplane substantially parallel to that of the cutter bar for engaging avalve-casing and holding the cutter-bar to said casing, of means foreffecting relative radial movement of said parts with respect to acommon center and a cutter associated with the cutter bar.

8. In a tool of the class described, the combination with a cutter-barhaving near the working end thereof a plurality of parts relativelymovable in a plane substantially parallel to that of the cutter bar forengaging a valve-casing and holding the cutterbar to said casing, ofmeans for shifting said parts relatively to a common center and forholding them in such shifted posi- 1toion and a cutter associated withthe cutter 9. In a tool of the class described, the combination with acutter-bar havin near the working end thereof a plurality 0' partsrelatively movable in a plane substantially parallel to that of thecutter bar for engaging a valve-casing and holding the cutterbar to saidcasing, of means for shifting said parts equal distances radiallyrelatively to a common center and for holding them in such shiftedpositions and a cutter associated with the cutter bar.

10. In a tool of the class described, the combination with a cutter-barhaving near the working end thereof a plurality of pivoted leversmovable relatively to a common center in a plane substantially parallelto that of the cutter bar and each carrying a holding device forengaging a valve-casing and holding the cutter-bar to said casing, ofmeans for swinging said levers toward or from said common center and acutter associated with the cutter bar.

11. In a tool of the class described, the combination with a cutter-barhaving near the working end thereof a plurality of pivoted leversmovable relatively to a common center in a plane substantially parallelto that of the cutter bar and each carrying a holding device forengaging a valve-casing and holding the cutter-bar to said casing, ofmeans for swinging said levers toward or from said common center saidmeans including an operating cam-lever and a cutter associated with thecutter bar.

12. In a tool of the class described, the combination with a cutter-barhaving near the working end thereof a plurality of piv oted leversmovable relatively to a common center in a plane substantially parallelto that of the cutter bar and each carrying a holding device forengaging a valve-casing and holding the cutter-bar to said casing, ofmeans for swinging said levers toward or from said common center andholding them in such shifted positions said means including an operatingcam-lever and means for securing said cam-lever in any adjusted positionand a cutter associated with the cutter bar.

13. In a tool of the class described, the combination with a cutter-barhaving near the working end thereof a pivot element and also having anadjustable centering device arranged on one side of the cutter bar andconcentric with the pivot element for engaging a valve-casing andholding the cutter-bar to said casing, of means for varying theadjustment of said centering device and a cutter associated with thecutter bar.

14. In a tool of the class described, the combination with a cutter-bar,of a pivot element and an adjustable centering device mounted on acommon support on one side of said cutterbar, and means for varying theadjustment of said centering device and a cutter associated with thecutter bar.

15. In a tool of the class described, the combination with a cutter-bar,of a pivot element and an adjustable centering device mounted 011 acommon support on one side of said cuttenbar, and means for varying theadjustment of said centering device with respect to said center and acutter associated with the cutter bar.

16. In a tool of the class described, the combination with a eutterbar,of a pivot element and a multi-element adjustable centering devicemounted 011 a common support on one side of said cutter-bar, and meansfor shifting the elements of said centering device equal distancesradially with respect to said center to vary the adjustment of saidcentering device and a cutter associated with the cutter bar.

17. In a tool of the class described, the combination with a cutter-bar,of a pivot element and an adjustable centering device mounted on acommon support on one side of said cutter-bar near one end thereof, operating means extending lengthwise of said cutter-bar to a point nearthe other end thereof for varying the adjustment of said centeringdevice and a tool element associated with the cutter bar.

18. In a tool of the class described, the combination with a cutter-bar,of a pivot element and an adjustable centering device mounted on acommon support on one side of said cutter-bar near one end thereof,operating means including a cam-lever extending lengthwise of saidcutter-bar to a point near the other end thereof for varying theadjustment of said centering device and a tool element associated withthe cutter bar.

19. A tool of the class described, comprising a cutter and a. cutter-barhaving a pivotal connection, and means on the cutterbar for imparting tothe element of the pivotal connection carried thereby a movementtransverse to the cutter-bar and from a point distant from said pivotalconnection.

20. A tool of the class described, compris ing a cutter and a cutter-barhaving a pivotal connection, and means on the cutterbar and including anoperating rod extending to a point distant from said connection forimparting to the element of said pivotal connection carried by thecutter-bar a movement transverse thereto.

9.1. In a tool of the class described, the combination with a cutter-barhaving near the working end thereof a pivot element and also having anadjustable centering device for engaging a valve-casing and holding thecutter-bar to said casing, of two separate means each extending to apoint near the other end of the cutter-bar one for shifting said pivotelement crosswise of said cutterbar and the other for adjusting saidcentering device.

22. In a tool of the class described, the combination with a cutter barhaving near the working end thereof a pivot element and also having anadjustable centering device for engaging a valve-casing and holding thecutter-bar to said casing, of means for shifting said pivot elementcrosswise of the cutter-bar, and means for adjusting said centeringdevice.

23. In a tool of the class described, the cmn'bination with acutter-bar, of a pivot element and, an adjustable centering devicemounted on a common support on said cut: ter-bar, means for shiftingsaid pivot element crosswise of said common support, and means foradjusting said. centering device.

24. In a tool of the class described, the combination with a cutter-barhaving near the working end thereof a pivot element, of means includinga cam-slide for shifting said pivot element crosswise of said cutterbar.

25. In a tool of the class described, the combination with a cutter-bar,of a pivot element and an adjustable centering device mounted on acommon support on said outter-bar, means including a cam-slide forshifting said pivot element crosswise of said common support, and meansfor adjusting said centering device.

26. In a tool of the class described, the

combination with a cutter-bar, of a pivot element disposed transverselythereof, and means for affording alternatively both a free movement ofsaid pivot element crosswise of the cutter-bar and a gradual adjustmentof the same in said direction.

27. In a tool of the class described, the combination with a cutter-barhaving a pivot element, of a centering device cooperative therewith andhaving means for adjusting it to various positions corresponding toseats of different sizes and a tool element associated with the cutterbar.

28. In a tool of the class described, the combination with a cutter-barhaving a pivot element, of a centering device having valve seat engagingportions movable into circles having centers common with said pivot andhaving means for adjusting it radially to various positionscorresponding to seats of different sizes and a tool element associatedwith the cutter bar.

29. In a tool of the class described, the combination with a cutter-barhaving a pivot element, of a centering device cooperative therewith andhaving means for setting it for large and small seats and a tool elementassociated with the cutter bar.

30. In a tool of the class described, the combination with a cutter-barhaving a pivot element, of a centering device having valve seat engagingelements movable into circles having centers common with said pivotelement and having means for setting it for large and small seats and atool element associated with the cutter bar.

81. In a tool of the class described, the combination with a cutter-barhaving a pivot element, of a centering device cooperative therewith andhaving a circuit of pivoted holding levers the fulcrum of each of whichis shiftable to two different positions corre sponding to large andsmall seats and a tool element associated with the cutter bar.

32. In a tool of the class described, the combination with a cutter-barhaving a pivot element, of a centering device cooperative therewith andhaving means for setting said device for large and small seats and alsohaving means for obtaining a considerable range of adjustment in each ofsaid settings.

33. In a tool of the class described, the combination with a cuttenbarhaving a pivot element, of an extensible multi-element centering devicecooperative therewith and hav ing means for setting said device forlarge and small seats and a tool element associated with the cutter bar.

3%. In a tool of the class described, the combination with a cutter-barhaving a pivot element, of a centering device having valve seat engagingelements movable into circles having centers common with said pivotelement and having means for setting said device for large and smallseats and a tool element associated with the cutter bar.

35. In a tool of the class described, the combination with a cutter-barhaving a pivot element, of a centering device having valve seat engagingelements movable into circles having centers common with said pivotelement and having a circuit of pivoted holding levers the fulcrum ofeach of which is shiftable to two difierent positions corresponding tolarge and small seats, said centering device also having means for0btaining a considerable range of adjustment in each of said settings.

36. In a tool of the class described, a cutter bar having meansconstructed and arranged to engage within the circle of a valve seat toalone hold the same in position, and a facing cutter mounted on thecutter bar.

Signed by the said F RANK L. SMITH at Chicago, in the county of Cook andState of Illinois, this 4th day of February A. D. 1916.

FRANK L. SMITH.

Signed by thesaid THoMAsB. WILLIAMS at Orange, in the county of Franklinand State of Massachusetts, this 26th day of January A. D. 1916.

THOMAS B. l/VILLIAMS.

Witness:

FRED A. DEXTER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. C.

